A star with a mass of more than three times that of the sun contracts so much upon cooling that is loses its capacity to radiate; neither material particles nor light are able to overcome its gravitational field (such an object is called a black hole).Taking mass of sun to be 2times10^(30)kg the radius of such an object could be (approximately)
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Use the equation the Schwarchild radius or the black hole's radius should be
R=2GM/C^2
substitute the mass here and c = 3*10^8 and get the answer
G= 6.67*10^-11
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